package net.minecraft.entity.ai;

import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityCreature;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.pathfinding.PathEntity;
import net.minecraft.util.BlockPos;
import net.minecraft.world.World;

public class EntityAIAttackOnCollide extends EntityAIBase {
	World worldObj;
	protected EntityCreature attacker;

	/**
	 * An amount of decrementing ticks that allows the entity to attack once the
	 * tick reaches 0.
	 */
	int attackTick;

	/** The speed with which the mob will approach the target */
	double speedTowardsTarget;

	/**
	 * When true, the mob will continue chasing its target, even if it can't find a
	 * path to them right now.
	 */
	boolean longMemory;

	/** The PathEntity of our entity. */
	PathEntity entityPathEntity;
	Class<? extends Entity> classTarget;
	private int delayCounter;
	private double targetX;
	private double targetY;
	private double targetZ;

	public EntityAIAttackOnCollide(EntityCreature creature, Class<? extends Entity> targetClass, double speedIn,
			boolean useLongMemory) {
		this(creature, speedIn, useLongMemory);
		this.classTarget = targetClass;
	}

	public EntityAIAttackOnCollide(EntityCreature creature, double speedIn, boolean useLongMemory) {
		this.attacker = creature;
		this.worldObj = creature.worldObj;
		this.speedTowardsTarget = speedIn;
		this.longMemory = useLongMemory;
		this.setMutexBits(3);
	}

	/**
	 * Returns whether the EntityAIBase should begin execution.
	 */
	public boolean shouldExecute() {
		EntityLivingBase entitylivingbase = this.attacker.getAttackTarget();

		if (entitylivingbase == null) {
			return false;
		} else if (!entitylivingbase.isEntityAlive()) {
			return false;
		} else if (this.classTarget != null && !this.classTarget.isAssignableFrom(entitylivingbase.getClass())) {
			return false;
		} else {
			this.entityPathEntity = this.attacker.getNavigator().getPathToEntityLiving(entitylivingbase);
			return this.entityPathEntity != null;
		}
	}

	/**
	 * Returns whether an in-progress EntityAIBase should continue executing
	 */
	public boolean continueExecuting() {
		EntityLivingBase entitylivingbase = this.attacker.getAttackTarget();
		return entitylivingbase == null ? false
				: (!entitylivingbase.isEntityAlive() ? false
						: (!this.longMemory ? !this.attacker.getNavigator().noPath()
								: this.attacker.isWithinHomeDistanceFromPosition(new BlockPos(entitylivingbase))));
	}

	/**
	 * Execute a one shot task or start executing a continuous task
	 */
	public void startExecuting() {
		this.attacker.getNavigator().setPath(this.entityPathEntity, this.speedTowardsTarget);
		this.delayCounter = 0;
	}

	/**
	 * Resets the task
	 */
	public void resetTask() {
		this.attacker.getNavigator().clearPathEntity();
	}

	/**
	 * Updates the task
	 */
	public void updateTask() {
		EntityLivingBase entitylivingbase = this.attacker.getAttackTarget();
		this.attacker.getLookHelper().setLookPositionWithEntity(entitylivingbase, 30.0F, 30.0F);
		double d0 = this.attacker.getDistanceSq(entitylivingbase.posX, entitylivingbase.getEntityBoundingBox().minY,
				entitylivingbase.posZ);
		double d1 = this.func_179512_a(entitylivingbase);
		--this.delayCounter;

		if ((this.longMemory || this.attacker.getEntitySenses().canSee(entitylivingbase)) && this.delayCounter <= 0
				&& (this.targetX == 0.0D && this.targetY == 0.0D && this.targetZ == 0.0D
						|| entitylivingbase.getDistanceSq(this.targetX, this.targetY, this.targetZ) >= 1.0D
						|| this.attacker.getRNG().nextFloat() < 0.05F)) {
			this.targetX = entitylivingbase.posX;
			this.targetY = entitylivingbase.getEntityBoundingBox().minY;
			this.targetZ = entitylivingbase.posZ;
			this.delayCounter = 4 + this.attacker.getRNG().nextInt(7);

			if (d0 > 1024.0D) {
				this.delayCounter += 10;
			} else if (d0 > 256.0D) {
				this.delayCounter += 5;
			}

			if (!this.attacker.getNavigator().tryMoveToEntityLiving(entitylivingbase, this.speedTowardsTarget)) {
				this.delayCounter += 15;
			}
		}

		this.attackTick = Math.max(this.attackTick - 1, 0);

		if (d0 <= d1 && this.attackTick <= 0) {
			this.attackTick = 20;

			if (this.attacker.getHeldItem() != null) {
				this.attacker.swingItem();
			}

			this.attacker.attackEntityAsMob(entitylivingbase);
		}
	}

	protected double func_179512_a(EntityLivingBase attackTarget) {
		return (double) (this.attacker.width * 2.0F * this.attacker.width * 2.0F + attackTarget.width);
	}
}
